42
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November - December 2019
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www
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machinerylubrication.com
TEST YOUR KNOWLEDGE
This month, Machiner y Lubrication continues it s " Test Your Knowledge" sec tion in which we focus on a group of questions from Noria's
Prac tice Exam for Level I Machine Lubrication Technician and Machine Lubricant Analyst. The answers are located at the bottom of this
page. The complete 126-question prac tice test with expanded answers is available at store.noria.com.
ANSWERS
1. D
Other names for adhesive wear include galling, scuffing, seizing and severe sliding.
Adhesive
wear normally occurs during machine starts, loss of film strength and
overload/overspeed conditions. Proper lubricant selection is essential to control this
wear mode.
2. A
This is to assess the actual condition of the oil before it gets filtered.
3. B
Compatibility
of different greases is a serious issue that mainly depends on the thick-
ener type. In general, most grease thickeners are incompatible, so extreme caution is
required
when switching from one grease type to another.
1. Adhesive wear can be described as:
A) e adhesion of wear debris to a layer of varnish
B) e adhesion of a layer of oil to the metal surface
C) e transfer of silicon particles from one metal surface to another
D) e transfer of metal from one surface to another through a localized
welding process
E) None of the above
2. Oil samples from an off-line (kidney-loop) filtration
circuit should be taken:
A) Downstream of the pump, upstream of the filter
B) Downstream of the reservoir, upstream of the pump (before the pump)
C) Downstream of the filter
D) From the sump
E) From the drain plug
3. Compatibility of different greases:
A) Is only a minor issue and often can be ignored
B) Is a major issue that is dependent on the thickener used
C) Is independent of the thickeners used
D) Can be linked to the age of the grease involved
E) Is dependent only on the base oil used
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